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1 Distributed by: The content and copyrights of the attached material are the property of its owner.
2 SOLID-STATE HEXADECIMAL DISPLAY WITH INTEGRAL TTL CIRCUIT TO ACCEPT, STORE, AND DISPLAY 4-BIT BINARY DATA Inch (7,62-mm) Character Height Internal TTL MSI Chip With Latch, Decoder, High Brightness and Driver Left-and-Right-Hand Decimals Operates from 5-V Supply Separate LED and Logic Power Supplies May Be Used Wide Viewing Angle Constant-Current Drive for Hexadecimal Characters Easy System Interface mechanical data These assemblies consist of display chips and a TTL MSI chip mounted on a header with a red molded plastic body. Multiple displays may be mounted on inch (,43-mm) centers. CL OF PIN 0.00 (0,25) NOM 4 Sides (0,67) (9,65) 0.50 (3,80) (,9) MAX (7,62) 0.00 (0,26) (,9) MAX (,78) CL OF PIN (2,6) MAX (6,90) 0.05 (0,38) (9,3) (8,29) (0,56) 0.08 (0,46) DIA All Pins 0.70 (4,30) 0.60 (4,0) Logic Chip 0.60 (4,0) (2,54) TP 2 Places (See Note B) (2,6) MAX Seating Plane 0.70 (4,32) MIN (0,56) 0.08 (0,46) 0.40 (3,60) 0.0 (2,80) DIA All Pins PIN LED SUPPLY VOLTAGE PIN 2 LATCH DATA INPUT B PIN 3 LATCH DATA INPUT A PIN 4 LEFT DECIMAL POINT CATHODE PIN 5 LATCH STROBE INPUT PIN 6 OMITTED PIN 7 COMMON GROUND PIN 8 BLANKING INPUT PIN 9 OMITTED PIN 0 RIGHT DECIMAL POINT CATHODE PIN OMITTED PIN 2 LATCH DATA INPUT D PIN 3 LATCH DATA INPUT C PIN 4 LOGIC SUPPLY VOLTAGE, VCC NOTES: A. All linear dimensions are in inches and (parenthetically) in millimeters. B. The true-position pin spacing is 0.00 (2,54) between centerlines. Each centerline is located within 0.00 ( 0,26) of its true longitudinal position relative to pins and 4. C. Associated centerlines of character segments and decimal point dimensions are nominal. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 997, Texas Instruments Incorporated POST OFFICE BOX DALLAS, TEXAS 75265
3 description This hexadecimal display contains a four-bit latch, decoder, driver, and 4 7 light-emitting-diode (LED) character with two externally driven decimal points in a 4-pin package. A description of the input functions of this device follows. FUNCTION PIN NO. DESCRIPTION LATCH STROBE INPUT 5 When low, the data in the latches follow the data on the latch data inputs. When high, the data in the latches will not change. If the display is blanked and then restored while the enable input is high, the previous character will again be displayed. BLANKING INPUT 8 When high, the display is blanked regardless of the levels of the other inputs. When low, a character is displayed as determined by the data in the latches. The blanking input may be pulsed for intensity modulation. LATCH DATA INPUTS (A, B, C, D) 3, 2, 3, 2 Data on these inputs are entered into the latches when the enable input is low. The binary weights of these inputs are A =, B = 2, C = 4, D = 8. DECIMAL POINT CATHODES 4, 0 These LEDs are not connected to the logic chip. If a decimal point is used, an external resistor or other current-limiting mechanism must be connected in series with it. LED SUPPLY This connection permits the user to save on regulated VCC current by using a separate LED supply, or it may be externally connected to the logic supply (VCC). LOGIC SUPPLY VOLTAGE (VCC) 4 Separate VCC connection for the logic chip COMMON GROUND 7 This is the negative terminal for all logic and LED currents except for the decimal points. The LED driver outputs are designed to maintain a relatively constant on-level current of approximately 5 ma through each LED that forms the hexadecimal character. This current is virtually independent of the LED supply voltage within the recommended operating conditions. Drive current varies slightly with changes in logic supply voltage resulting in a change in luminous intensity as shown in Figure 2. This change will not be noticeable to the eye. The decimal point anodes are connected to the LED supply; the cathodes are connected to external pins. Since there is no current limiting built into the decimal point circuits, limiting must be provided externally if the decimal points are used. The resultant displays for the values of the binary data in the latches are as shown below POST OFFICE BOX DALLAS, TEXAS 75265
4 functional block diagram LED Supply Logic Supply A Latch Data Inputs B C 4-Bit Latch Decoder Constant Current Driver D Latch Strobe Input Blanking Input Left Decimal Point Cathode Right Decimal Point Cathode absolute maximum ratings over operating case temperature range (unless otherwise noted) NOTES: Supply voltage, V CC, logic (see Note ) V Supply voltage, LED (see Note ) V Input voltage (pins 2, 3, 5, 8, 2, 3) (see Note ) V Decimal point current ma Operating case temperature range (see Note 2) C to 85 C Storage temperature range C to 85 C. Voltage values are with respect to common ground terminal. 2. Case temperature is the surface temperature of the plastic measured directly over the integrated circuit. Forced-air cooling may be required to maintain this temperature. recommended operating conditions MIN NOM MAX UNIT Supply voltage, VCC, logic V Supply voltage, VLED, LED V Decimal point current, IF(DP) 5 ma Pulse duration, tw, latch strobe 40 ns Setup time, tsu 50 ns Hold time, th 40 ns POST OFFICE BOX DALLAS, TEXAS
5 operating characteristics at T A = 25 C PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Average per VCC = 5 V, VLED = 5 V, µcd Iv Luminous intensity (see Note 3) character LED See Note 4 y( Each decimal IF(DP) = 5 ma µcd λp Wavelength at peak emission VCC = 5 V, VLED = 5 V, 660 nm λ Spectral bandwidth IF(DP) = 5 ma, See Note 5 20 nm VIH High-level ilnput voltage 2 V VIL Low-level input voltage 0.8 V VIK Input clamp voltage VCC = 4.75 V, II = 2 ma.5 V II Input current VCC = 5.5 V, VI = 5.5 V ma IIH High-level input current VCC = 5.5 V, VI = 2.4 V 40 µa IIL Low-level input current VCC = 5.5 V, VI = 0.4 V.6 ma ICC Supply current, logic VCC = 5.5 V, VLED = 5.5 V, ma IF(DP) = 5 ma, All inputs at 0 V ma ILED Supply current, LED NOTES: 3. Luminous intensity is measured with a light sensor and filter combination that approximates the CIE (International Commission on Illumination) eye-response curve. 4. This parameter is measured with displayed, then again with displayed. 5. These parameters are measured with displayed. TYPICAL CHARACTERISTICS 0.9 RELATIVE SPECTRAL CHARACTERISTIC VCC = 5 V TC = 25 C Relative Luminous Intensity λ Wavelength nm Figure 4 POST OFFICE BOX DALLAS, TEXAS 75265
6 TYPICAL CHARACTERISTICS V CC = 5 V Luminous Intensity Relative to RELATIVE LUMINOUS INTENSITY vs LOGIC SUPPLY VOLTAGE VLED = 5 V TC = 25 C T C = 25 C Luminous Intensity Relative to RELATIVE LUMINOUS INTENSITY vs CASE TEMPERATURE VCC = 5 V IV VCC Logic Supply Voltage V IV TC Case Temperature C Figure 2 Figure 3 POST OFFICE BOX DALLAS, TEXAS
7 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ( CRITICAL APPLICATIONS ). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER S RISK. In order to minimize risks associated with the customer s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI s publication of information regarding any third party s products or services does not constitute TI s approval, warranty or endorsement thereof. Copyright 998, Texas Instruments Incorporated
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